The dark water had already surrendered the tenth step when Qiao Ming took up his sounding reel.
Beneath the rusticated archway of Entry hall 021, the receding tide left behind a glassy sheen across the green red stone flags. A fringe of pale foam clung to the fluted base of each pillar, whispering as the bubbles broke against the stone. The salt water was cold. It was drawn from the deep breath flow channels that wound through the lower foundations of the House, and it smelled of wet bladderwrack, crushed mussel shells, and the clean stone chill of underwater stone.
Qiao Ming stood barefoot upon the dry riser of the eleventh step. His toes, wide and horn-calloused from years of gripping slick banded limestone, curved naturally over the chiseled edge. Water dripped from his rolled hemp trousers, splashing with a light, regular patter against the red stone. He didn’t hurry to dry himself. In the lower entry halls, dampness was the condition of life. To fight the salt was to quarrel with the ocean itself.
He wound the sixty-fathom sounding line onto its ox-bone spool with deliberate, even rotations of his wrist. The braided cord—spun from black stallion hair twisted together with wild sea-silk—shed cold droplets as it coiled across the notched bone frame. At the end-post eyelet hung the eight-pound six-sided plumb-bob of soft lead. Its dull grey facets were scarred by thousands of landings upon drowned stepped stone bases and silted steps.
Turning the weight in his palm, Qiao Ming inspected the hollow animal fat cup recessed into its base. The mutton fat was packed firm, greyed slightly by the wash of the neap tide. Embedded in the wax were several fine specks of pale green silt and a single glassy needle from a siliceous sponge.
“Twelve deep-water lengths at the gutter,” he murmured into the stillness of the hall. “The neap ebb is true to the second notch. The lower water tanks will remain quiet until the fifth hour.”
He wiped the lead clean with a scrap of oiled flannel, replaced the fresh animal fat with a thumb-press, and hung the weight from the bronze harness ring at his right hip. The heavy plumb settled against his thigh with a familiar, reassuring thud.
Before him rose the long ascent to the upper reaches: the Stair of the Two Watchers.
One hundred and forty-four steps of grey pale limestone stone climbed steeply between the flanks of two huge statues. The figures sat upon massive stone thrones chiseled directly from the living bedrock of the hall, their stone backs merging seamlessly with the towering cut stone walls. Each figure rose forty arm-lengths toward the shadowed groin vault, their hands resting flat upon knees as broad as river barges. Hundreds of years of tidal rise and fall had left a dark tideline across their shins, black with crusted acorn barnacles and dried sea-lettuce. But above the thirty-arm-length mark the stone was flawless, dry, and pale as bone.
Qiao Ming stepped onto the first riser. His bare soles made no sound against the pale limestone.
With every dozen steps, the sound character of the House shifted. Below, in the drowned water tanks, sound was heavy and ringing, carrying the hollow thud of water against stone and the deep, high-pressure sigh of air pockets trapped in underwater vaults. As he climbed, that heavy oceanic bellow pulled back into a faint, nonstop murmur, like the hum of blood through the veins of an arm.
At the forty-eighth step, he passed the splash zone. The air lost its sharp maritime bite. The stinging iodine of kelp and the bitter chill of salt water gave way to a still, powdery dryness. The stone here had not tasted seawater in ages. It breathed only the slow drafts that drifted between the upper rows of stone pillars.
He paused at the ninety-sixth step to adjust the cross-chest strap of his leather harness. Here, set into the wall behind the left elbow of the northern watcher, was a small square niche containing a stone water-catchment jar. Qiao Ming dipped his bone cup into the basin. The water was sweet and ice-cold, condensed from the clouds that gathered in the high vaulting during the night. He drank slowly, savoring the flat, stone purity that tasted of limestone rather than the sea.
“Thank you, elder brother,” he whispered, resting his fingertips for a moment against the statue’s rough dark rock drapery. The stone was cool, indifferent, yet solid beyond all mortal fragility.
He resumed his climb until his head rose above the lip of the landing.
The Dry Eighth Gallery opened before him like a canyon of quiet cut stone. Sixty arm-lengths above the flooded stone floor of the lower entry halls, this great hall ran east-to-west beneath a series of quadripartite rib vaults supported by paired pilasters of green-wave marble. The stone was banded with delicate ripples of pale sage and cream, resembling stale pools frozen into stone.
The air here possessed an entirely distinct fragrance. It was dry, ancient, and deeply calm. The air smelled of fine limestone flour that had settled undisturbed in the flutings of the columns, of old cedar wood from decayed staging planks, and, above all, of beeswax.
Hundreds of years ago, when the builders had laid the final arch stones of the gallery arches, they had pointed every joint with a compound of wet lime plaster and boiled beeswax to prevent the humidity of the lower halls from working into the stonework. In the dry warmth of this raised terrace, the wax had never perished. It gave the gallery a mellow, honeyed scent, faint but persistent, like the inside of a forgotten monastic archive.
Along the south wall, suspended from copper hooks driven into the mortar, hung twenty bundles of dried eelgrass. Qiao Ming had cut them himself during the great spring ebb three moons ago, washing them in salty drainage and carrying them up the long stair to dry. The grass had cured into pale, brittle ribbons that rustled softly whenever a draft moved through the gallery. In the coming cold season, they would provide kindling for his small hearth fires and clean, aromatic padding for his sleeping nook.
He walked down the center of the gallery, his footsteps leaving pale oval impressions in the fine dust that coated the flags. Near the third pilaster. There, the floor widened into a half-round bay overlooking the drowned nave below, stood a low stone railing of white banded limestone.
Qiao Ming approached the low roof wall and looked down.
Through the dim, vaulted space below, the lower halls stretched into emerald twilight. Far beneath his feet, the waters of the neap tide lay motionless, reflecting the pale light that filtered through the high window row slits. The statues in the lower cross-hall appeared like dark islands rising from a quiet sea. Emperors, monks, weavers, and helmsmen, all frozen in unending contemplation, their stone faces washed twice daily by the indifferent tide.
From his tunic pocket he drew the Folded brass star-compass.
The instrument was heavy, fashioned from salt-darkened deep-sea brass that resisted green rust. Its three nested plates were engraved with stereographic projections of star-patterns that no longer shone in the open sky, their map points calculated for a sky hemisphere that had drowned before the first cut stone was squared. He unfolded the sighting rule and leveled the base against the level plane of the stone railing.
The fine-scale measuring tongs clicked softly as he lined up the sight vane with the northern high window row archway. The brass ephemeris gears whirred with a tiny, dry click. He turned the angle of the surrounding draft and the air pressure of the gallery into tactile readings along the graduated edge.
The slate confirmed the balance of the upper stratum. The air pressure stood at exactly one standard air, free from the crushing water-pressure fluctuations that racked the lower foundations. The giant statues in the nave remained quiescent, their stone deep ring dormant within the safe baseline.
Qiao Ming closed the star compass with a muted click and secured it within its greased sheepskin pouch.
He turned toward the inner wall of the bay. Here. There, the groin vault sprang from a fluted ledge-stone carved with the likeness of an acanthus leaf, his eyes caught an irregularity in the mortar.
He stepped closer, raising his animal fat lantern to the seam.
A micro-fissure ran through the beeswax caulking. It was no wider than a horsehair, scarcely three inches in length, but the pale wax had separated from the green-wave marble stone. A pinch of powdered limestone had spilled from the crack, gathering like white pollen upon the shoulder of the acanthus carving.
Qiao Ming touched the fissure with the tip of his forefinger. The gap was dry, but through the stone he felt a tiny, high-hum shaking—a distant tension that did not belong to the natural settling of the stonework.
The Great Flooding was not a dead weight that rested motionless upon the earth. It was an active, breathing ocean of dissolved laws and liquid aether, exerting an unceasing, crushing pressure against every outside stone support prop and keel-rib of the House. Even here, sixty arm-lengths above the splash line, the stone felt the burden.
“You are carrying a heavy sea today, little vault,” Qiao Ming said softly, smoothing his thumb across the split wax.
From his apron pocket he took a small lump of raw, raw, unwhitened beeswax, warmed it between his calloused palms until it softened, and pressed it firmly into the seam. He worked the wax into the crack until the fissure was sealed flush with the stone, then smoothed the surface with his bone-handled spatula.
The gallery received the repair in silence. The dry smell of the fresh wax mingled with the scent of the cured eelgrass and the cold limestone dust.
He gathered his reed basket and adjusted his sounding line. There was work leftover before the turn of the tide. Down the eastern hall, three entry halls past the drying racks, lay the entrance to the side water tank where the Salt Child slept. The little one had waited since the last neap tide for fresh cowries from the lower shelves, and Qiao Ming did not intend to arrive empty-handed.
With light, measured strides, his bare feet carrying him without a sound across the pale cut stone floor, the Mapmaker continued his survey of the peaceful stone.